The arrangement, type, and number of the teeth in a particular species
Glossary: dentition
Glossary: deoxygenate
To remove oxygen from.
Glossary: depensation
Reduction in breeding population size leading to reduced fecundity in the overall population or stock of a species.
Glossary: depressed
Vertically or dorsoventrally flattened.
Glossary: derived
Used in phylogenetics in reference to a character or character state not present in the ancestral form of a species; apomorphic.
Glossary: derived character state
See derived trait.
Glossary: derived state
See derived trait.
Glossary: derived trait
In phylogenetics, a trait present in an organism which was absent in the last common ancestor of the group being considered; an apomorphy. Also used to refer to traits present in the ancestral form that have subsequently been lost.
Glossary: dermal
Of or relating to skin.
Glossary: dermal bone
Bone-type ossifying directly from connective tissue membranes and thus lacking a cartilaginous predecessor. Tend to be more numerous in primitive fish forms.
Glossary: dermal denticle
See placoid scale.
Glossary: dermis
Innermost layer of skin containing nerve endings and blood vessels. Lies under the epidermis and also known as corium.
Glossary: description
Used in ichthyology in reference to a written description of a new species, usually in the form of a scientifically-published paper though many have been also appeared in aquarium literature, particularly in the late twentieth century. Also referred to as ‘type description’ or ‘original description’.
Glossary: designation
In icthyology, the nomenclatural act by which the type specimen of a previously or newly-established genus, subgenus, species, or subspecies is fixed via an express statement.
Glossary: dessicated
Dry; completely dried out.
Glossary: detritus
In biology, organic debris most often formed via the decomposition of organisms.
Glossary: diadromous
A fish that migrates between fresh and salt waters.
Glossary: diapause
Period of suspended development in an organism characterised by greatly reduced metabolic rate; resting phase. Especially common under times of environmental stress, e.g., hibernation, aestivation.
Glossary: diaphanous
Delicate, translucent.
Glossary: diatom
Large group of algae often referred to as 'brown algae' in relation to aquaria. Most are unicellular but there also exist colonial types. Very common component of phytoplankton.
Product reviewers wanted
Hello! Very much interested in writing for you, please include me in the info. Thank you for the opportunity!
6th Sep 2020
Product reviewers wanted
I would be interested in reviewing products. Before retiring I was a technical writer and managed a Quality Management Program.
30th Aug 2020
Product reviewers wanted
I'm interested and can write reviews from the perspective of someone new to the hobby. I'm only 3-4 months in, but hopefully I can help someone that's...
23rd Aug 2020
Product reviewers wanted
I’m interested in doing this if there is still availability, it sounds like fun! Thanks
19th Aug 2020
Barbodes semifasciolatus – Golden Barb* (Barbus sachsii, Puntius schuberti)
I simply had a question (please forgive if this is not allowed, I read the FAQ but I was not sure). I was wondering if there is any evidence of offsp...
12th Aug 2020